161897535 has 48 divisors (see below), whose sum is σ = 292795776. Its totient is φ = 85818528.

The previous prime is 161897509. The next prime is 161897539. The reversal of 161897535 is 535798161.

It is a happy number.

161897535 is a `hidden beast` number, since 16 + 18 + 97 + 535 = 666.

It is not a de Polignac number, because 161897535 - 2⁵ = 161897503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161897539) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275512 + ... + 276098.

It is an arithmetic number, because the mean of its divisors is an integer number (6099912).

Almost surely, 2^161897535 is an apocalyptic number.

161897535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161897535 is a deficient number, since it is larger than the sum of its proper divisors (130898241).

161897535 is an equidigital number, since it uses as much as digits as its factorization.

161897535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 822 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 161897535 is about 12723.8962193190. The cubic root of 161897535 is about 545.0212207319.

The spelling of 161897535 in words is "one hundred sixty-one million, eight hundred ninety-seven thousand, five hundred thirty-five".